Optical fiber high-precision timing device and method based on single photon detection

Abstract

The invention provides an optical fiber high-precision timing device and method based on single photon detection. The method comprises the steps that: an atomic clock source sends a clock signal and asecond pulse signal to a timing center station; the timing center station generates an encoded optical pulse signal by using the clock source signal and injects the encoded optical pulse signal intoa fiber link; a terminal station partially reflects the encoded optical pulse signal and returns the encoded optical pulse signal to the same fiber link; the center station returns the encoded opticalpulse signal by using a single photon detector, measures loopback delay and calculates and compensates single-direction propagation delay by using loopback transmission delay; the terminal station performs photoelectric conversion on the encoded optical pulse signal which is subjected to delay pre-compensation by the center station to complete time synchronization. The device and the method havethe advantages of uniform benchmark, high stability and the guarantee of the long-term stability and short-term stability of time transmission at the same time.

Description

Technical field [0001] The invention relates to an optical fiber link high-precision time service device and method, in particular to a single-photon detection-based optical fiber high-precision time service device and method. Background technique [0002] All major countries in the world are actively developing their own high-performance time and frequency systems. The most famous ones are space-based timing systems, such as the GPS system in the United States, GLONASS in Russia, the Galileo system in Europe, and the Beidou system under construction in my country. The timing services that our country can provide to ordinary people and special users at present include short-wave timing, long-wave timing, satellite timing, Internet timing, and television timing. Space-based time-frequency networks have limited accuracy due to random fluctuations in open channels and external end devices. For example, the timing accuracy of ordinary GPS systems is on the order of 10 nanoseconds, an...

AI Technical Summary

Problems solved by technology

[0007] Purpose of the invention: Aiming at the problem that the asymmetric timing deviation is difficult to suppress and eliminate in the existing timing method based on wavelength division multiplexing technology and the cost of timing link transformation is relatively high, a high-precision optical fiber timing device and method based on single-photon detection is proposed

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